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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5752) Explore light weight Automaton replacement
Date Sat, 14 Jun 2014 20:51:02 GMT


ASF subversion and git services commented on LUCENE-5752:

Commit 1602623 from [~mikemccand] in branch 'dev/branches/lucene5752'
[ ]

LUCENE-5752: track isDeterministic privately in LA; also remove states not reachable from
initial node in removeDeadStates; move prefix handling into LevA

> Explore light weight Automaton replacement
> ------------------------------------------
>                 Key: LUCENE-5752
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
> This effort started with the patch on LUCENE-4556, to create a "light
> weight" replacement for the current object-heavy Automaton class
> (which creates separate State and Transition objects).
> I took that initial patch much further, and cutover most places in
> Lucene that use Automaton to LightAutomaton.  Tests pass.
> The core idea of LightAutomaton is all states are ints, and you build
> up the automaton under the restriction that you add all outgoing
> transitions one state at a time.  This worked well for most
> operations, but for some (e.g. UTF32ToUTF8!!) it was harder, so I also
> added a separate builder to add transitions in any order and then in
> the end they are sorted and added to the real automaton.
> If this is successful I think we should just replace the current
> Automaton with LightAutomaton; right now they both exist in my current
> patch...
> This is very much a work in progress, and I'm not sure the
> restrictions the API imposes are "reasonable" (some algos got uglier).
> But I think it's at least worth exploring/iterating... I'll make a branch and
> commit my current state.

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